Singer, guitarist and main songwriter with Super Furry Animals.

Prior to Super Furry Animals's formation, Gruff played in a number of other bands, including the Creation Records-signed Emily, and Ffa Coffi Pawb.

Eclectic and eccentric, Gruff Rhys has released several solo albums. His debut album [m169930] released in 2005 and recorded entirely in his native Welsh language, followed by [m169929] released in 2007. [m312080], released in 2011, was the winner of the inaugural Welsh Music Prize in 2011. He released [m686027] in 2014. In 2016 he released [m1075794], the original soundtrack to the film with the same name. [m1375981] was released in 2018 and [m1605842] in 2019. (Don't) Welcome The Plague As A Blessing / The Babelsberg Basement Files was a Record Store Day 2020 release which featured raw recordings, from 2016, of songs which would eventually be released as [m1375981]. 2021 saw the release of [m2134882].

In 2008 Gruff collaborated with Boom Bip and released [m75083], a concept album with a string of guest musicians. The album was based on the rise and fall of John De Lorean, the founder of the De Lorean Motor Company. Their next collaboration, [m551705], was released in 2013. This was also a concept album and based on the life of Italian publisher and leftwing activist Giangiacomo Feltrinelli.

In 2010 Gruff collaborated with Brazilian eccentric Tony da Gatorra to release The Terror Of Cosmic Loneliness. In addition to this Gruff has collaborated with a host of other musicians, most notably for vocals for the track 'Just War' on [m194186] and 'Superfast Jellyfish' from [m231219].

In 2018 Gruff travelled to Johannesburg, South Africa with Africa Express and contributed to four tracks on [m1575913] and a further track on [m1620992], both of which were released in 2019.